Font Smoothing:
Windows puts an emphasis on sharpness/readability of text, at the cost of the font's true shape.
OS X puts the emphasis on font accuracy, at the cost of readability; The explanation I read was that Apple did this to give graphic designers a 'best approximation' of what they'd see on the printed page, that is, its a tradition started a long time ago.
In my opinion, Apple font smoothing is AWFUL. I must say, I have to think the defenders are crazy, or haven't used a nice Windows screen. Apple font is VERY FUZZY, even on the high res screens, though its much better on those.
I was on a mac for years and never had a problem with the screen (powerbook), but have been using Windows for a while now. When I look at the mac screens nowadays, the standard 13 and 15 in particular, I'm essentially baffled anyone buys them. Yet, so many do.
Screen Resolution:
Never use anything but the native resolution on your screen. I don't have to mention this; You'll see immediately for yourself how terrible an idea that is. I can only imagine those that suggest this have never tried it themselves.
The higher res screens make everything smaller, but when you zoom in on, say, a browser window, you'll get font that is much more smooth and less fuzzy than on, say, the 13. (The problem is you either 'zoom text only' and jumble the page components, or zoom everything together and then the images look crummy.)
As mentioned above, there are some things on the system you can adjust, but others you can't. Some people find small menu items, etc. intolerable. For others the trade-off is easy; Aside from better zoomed font, you have more screen real estate, which can make a huge difference when working in certain programs.
LED Backligting?
I don't know much about this technically, but I do suspect this has something to do with the unfriendliness of the modern macbook pro screens.
My Experience:
as i said, i was on a powerbook for years with no problems. that died almost two years ago now, and i've been using windows 'temporarily' ever since.
i used a toshiba for a while, at 1440x900 on a 14" screen, but most recently have been using my X61T thinkpad, at 1400x1050 on a 12" screen. Both are older tablet PCs; the useful kind of tablet!!!
My tablets are a bit grainy, but I've never had any eye strain problems on them. The pixel density is very high on my thinkpad and I do have to use it pretty close up but the font is beautifully sharp and very readable.
I'm a musician and have been shopping for a mac for ... (gulp) ... well, ever since the powerbook went. I've looked at the screens, in store, billions of times. The 2010 13" was undesirable in other ways, but this 2011 model is a performer. The jump to the 15" is a hefty one price-wise. If I found the screen on the 13 anything less than terrible, I would buy it (and use it mostly on a monitor).
Sadly, I can not look at that screen for even a minute without feeling absolutely blind, while reading text that is. For me, it will have to be a high res 15. Text is fuzzy on that too though, but its much, much better.
In fact, I just ordered a high res antiglare refurb 15 (that I may return for a quad core) and noticed right away it was weird on my eyes. I will use the machine for a few days and get back to you, but I'm in the same boat (on a high res antiglare); I don't know what it is, but it seems like my eyes don't like something about the screen.
TinkerTool:
http://www.bresink.com/osx/TinkerTool.html
This is a free utility made for OS X that allows you to customize various UI elements. It allows for light, medium, and strong font smoothing settings. Light is much less fuzzy, but unfortunately, also thinner so its not as nice on a white page. Medium seems decent.
I don't know if it really helps matters that much, but you might give it a shot.
If you don't want to download an app, you can achieve these settings via terminal commands; Just do a search for "font smoothing terminal command snow leopard", etc.
... I'll get back to you with my impressions of the HR AG 15 in a few days!